The influence of environment and carbonation of fiber cement tiles on the reflectance of a cool surface exposed in four Brazilian cities

Shirakawa, Márcia Aiko; Lima, Lucas Nascimento de; Gaylarde, Christine C.; Fernandes-Hachich, Vera; Silva, João de Athaydes; John, Vanderley Moacyr

doi:10.1016/j.enbuild.2021.111550

Cited by 4 publications

(9 citation statements)

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“…The study of durability of high reflective materials consists of displaying samples on exposure sites and analysing their surface optical properties over the years. Usually, the analyses are focused on reflectance measurements, colour change, and emissivity, with some research including microscopy [15,16], roughness [15] and other methods to help discuss the data found. Figure 1 indicates where exposure sites (ES) found in the literature are located (red markers), where in-situ measurements were conducted (blue markers) and where ongoing research is being carried out (yellow markers).…”

Section: Literature Reviewmentioning

confidence: 99%

“…In Brazil, several studies have been reported by [9,15,16,[25][26][27][28][29], with ongoing research being carried out by the members of the University of São Paulo and Federal University of Santa Catarina. In the studies proposed by [15], a white cool paint was exposed in 4 cities of the country (São Paulo, Pirassununga, Belém and São Sebastião) and presented different levels of degradation between the sites, caused by different weather conditions, microflora, and pollutants.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The first major factor that influenced the degradation of cool surfaces was pointed out by the authors that studied reflectance performance in more than one exposure site [9,10,15,19,20] with verification proving its effects on durability after comparing these results with single exposure site data.…”

Section: Macroclimatementioning

confidence: 99%

“…Based on the data described by the table, the positioning of the ESs was responsible for determining some relevant differences in reflectance performance, with the samples exposed during the unpublished work of De Lima showing reflectance maintenance, the samples of [16] variance over time, and the samples exposed by [15] presenting a smooth and continuous reflectance loss over the ageing campaign.…”

Section: Microclimatementioning

confidence: 99%

“…Shirakawa et. al (2021) [15] The ES used in this study was positioned on the top of a concrete roof, ~12m from the ground, far from trees and from high traffic ways. After one year of exposure of a white paint, it was found by microscopy the presence of filamentous fungi and yeasts.…”

Section: Exposure Site Descriptionmentioning

confidence: 99%

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Durability of high reflective materials designed for building envelopes

Lima

Shirakawa

John

2022

IOP Conf. Ser.: Earth Environ. Sci.

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As an alternative to mitigate the urban heat island effect, materials known as “cool surfaces” are a suitable passive technology for reducing heat transmittance into buildings and diminishing the electricity demand for cooling. However, due to ageing, the performance of cool surfaces becomes less effective, with decreasing solar reflectance generated by dust accumulation and microbial growth. However, there is little literature on the subject and the data usually present a local perspective in durability which makes harder to compare with other cases. This research conducted a systematic review on works approaching natural ageing of highly reflective materials to identify the main factors that influence the albedo durability of cool surfaces. The main factors found were macroclimate, microclimate, the tilt of exposure, materials characteristics, and substrate. The data analyses conducted in this research highlight the importance of having a general perspective when studying reflectance durability, since agents that don’t seem relevant when evaluating a local case can be important when comparing the general figure. The inspection promoted by this study might help future research to better analyse their results and connect the diffuse knowledge in the current state of the art.

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Section: Literature Reviewmentioning

confidence: 99%